John McCurdy of PA ca 1829-HELP

I have hit a roadblock in my research. Here is what I know: John McCurdy, b abt 1829 in Pennsylvania, married Catherine Rager (b Feb 1830) in 1861. He had a son named Emory. I BELIEVE that John's father's name was also John and that his mother's name was Betty Closin (sp), but I can't find any of his (or her) ancestors. Any information would be GREATLY appreciated.